Years ago I worked for a company where customers started seeing other customers' data. The cause was a bad hire decided to do a live debugging session in the p

Years ago I worked for a company where customers started seeing other customers' data. The cause was a bad hire decided to do a live debugging session in the production environment. (I stress bad hire because after I interviewed them, my feedback was that we shouldn't hire them.) It was kind of a mess to track down and clean up, too.